Meaningful and unique names?

Okay, so my older sister is having a child. Her name is Maris, and she wants to name the child something unique like her own name. If its a girl then she's will be named Aisling, which is Gaelic for vision/dream. They don't know if it's a boy or a girl though, and she has no idea about what to name it if he's a boy. She loves Egyptian names, as well as Roman, Greek, and Gaelic. Anything unique, not well used. She also wants it to be meaningful, Maris means "of the sea" and Aisling means "dream" so she's looking for something like that. Thanks :)